what are the safest wires to tap into 12V constant and ignition under the dash?

[55Mach1 10]

Should i go directly to the small fuse box or are there specific wires i can tap into?

 

i just need two 12V ignitions and one 12 V constant.

[Midlife 814]

Depends upon the year. For RUN only being hot, the only easy way to tap into the harness in a 70 is at the three prong clear plastic pin connector near the fusebox: red/yellow. It is also available under the hood on the blue two prong plug mating to the alternator (green/red wire). The fusebox is another source, but is typically not recommended.

 

On a 69, there is no good source under the dash. You have to cut/splice a wire with the green/red or red/green wire coming out of the ignition switch.

 

For 12V constant, the best source is the cigarette lighter wire (blue/white), but you have to tap into it or cut and splice wires into the line. This line is fused. Another source is the red/white wire going to the emergency flasher: it is also fused. Both of these lines are tied to the battery via the fuse box.

[55Mach1 10]

thanks Midlife my car is a 70 mach 1 il check those wire colors tomorrow

[LoneWolf2U 136]

Depends on how much draw will be applied to the wire tapped into.

Too much and blown fuses will result.

What are you seeking to operate?